<!DOCTYPE html>
<html>
<head>
  <style>
    body {
      font-family: Arial;
    }
    
    p {
      font-size: 16px;
      line-height: 1.5;
      letter-spacing: 1px;
      color: red;
      background-color: lightgray;
    }
    
    h1 {
      font-size: 28px;
      line-height: 1.2;
      letter-spacing: 2px;
      color: blue;
      background-color: white;
    }
  </style>
</head>
<body>
  <h1>标题</h1>
  <p>这是一个段落。</p>
</body>
</html>
